diff --git a/crates/ocs_doc_api/IMPLEMENTATION.md b/crates/ocs_doc_api/IMPLEMENTATION.md
index a0630584d..2e6bc0ca7 100644
--- a/crates/ocs_doc_api/IMPLEMENTATION.md
+++ b/crates/ocs_doc_api/IMPLEMENTATION.md
@@ -49,11 +49,11 @@ Phases are **spec-additive**: each is a `[[family]]`/`[[family.method]]` block i
 `ARCHITECTURE.md` § Workflow). No protocol change; new `Operation`/`Query`
 variants append at enum end.
 
-**Status:** Phase 0 (supported-family methods), Phase 2a (full 2D curves),
-Phase 3 (block references), Phase 4 (viewports), Phase 5 (media read-mostly) are
-**done** (all tested; 601 host lib + 8 crate unit tests green). Remaining sub-items:
-Phase 2b (annotations/hatch/dimension typed ops), attributes + nested traversal
-(P3), set_view + view query (P4), typed media ops (P5).
+**Status:** all five phases complete — Phase 0 (supported-family methods), Phase 2
+(full 2D curves + annotations incl. dimension sub-types), Phase 3 (block references
++ attributes + traversal + attribute definitions), Phase 4 (viewports + set_view +
+view query), Phase 5 (media read-mostly + typed raster image + typed table). All
+tested: 615 host lib + 8 crate unit + 3 spec↔wire consistency tests green.
 
 ### Phase 2 — full 2D + annotations
 - **Done (2a):** typed curve families `ArcCurve`/`Ellipse`/`Spline`/`Ray`/`XLine` —
@@ -73,8 +73,10 @@ Phase 2b (annotations/hatch/dimension typed ops), attributes + nested traversal
   (`GetDimensionMeasurement`), bounds. Covered by `phase2c_*` test.
 - **Done (2c-ii, sub-types):** `create_dimension_radius` / `create_dimension_diameter`
   (radial chord) and `create_dimension_angular` (vertex + 2 legs) → radial/degrees
-  measurements. Covered by `phase2cii_*` test. (`Angular2Ln` variant handled in
-  `measurement`; a dedicated constructor is a later refinement.)
+  measurements. Covered by `phase2cii_*` test.
+- **Done (2c-iii):** `create_dimension_angular2ln(vertex, first, second, arc_location)`
+  → `CreateDimensionAngular2Ln` (2-line angular; `DimensionAngular2Ln::new` computes
+  the angle). Covered by `phase2ciii_*` test. All documented dimension sub-types done.
 - **Unblocked:** `add_vertex` (polyline) and sweep profiles (Line/Circle/Arc/LwPolyline)
   are supported (Phase 0).
 
diff --git a/crates/ocs_doc_api/examples/common/mod.rs b/crates/ocs_doc_api/examples/common/mod.rs
index 5e49cb300..3d982cc62 100644
--- a/crates/ocs_doc_api/examples/common/mod.rs
+++ b/crates/ocs_doc_api/examples/common/mod.rs
@@ -206,6 +206,11 @@ impl DocApiBackend for MockBackend {
         }
         Ok(self.alloc("AttributeDefinition"))
     }
+    fn add_dimension_angular2ln(&mut self, _spec: &ocs_doc_api::ops::DimensionAngularSpec) -> ApiResult<ObjectId> {
+        let id = self.alloc("Dimension");
+        self.dimension_measurements.insert(id, 90.0);
+        Ok(id)
+    }
     fn add_table(&mut self, spec: &ocs_doc_api::ops::TableSpec) -> ApiResult<ObjectId> {
         let cols = spec.data.first().map(|r| r.len()).unwrap_or(0);
         if spec.data.is_empty() || cols == 0 || spec.data.iter().any(|r| r.len() != cols) {
diff --git a/crates/ocs_doc_api/spec/entities.toml b/crates/ocs_doc_api/spec/entities.toml
index e8442a563..b885693dd 100644
--- a/crates/ocs_doc_api/spec/entities.toml
+++ b/crates/ocs_doc_api/spec/entities.toml
@@ -346,6 +346,11 @@ name = "create_dimension_angular"
 args = [{ name = "vertex", ty = "[f64; 3]" }, { name = "first_point", ty = "[f64; 3]" }, { name = "second_point", ty = "[f64; 3]" }, { name = "arc_location", ty = "[f64; 3]" }]
 op = "CreateDimensionAngular"
 
+[[family.constructor]]
+name = "create_dimension_angular2ln"
+args = [{ name = "vertex", ty = "[f64; 3]" }, { name = "first_point", ty = "[f64; 3]" }, { name = "second_point", ty = "[f64; 3]" }, { name = "arc_location", ty = "[f64; 3]" }]
+op = "CreateDimensionAngular2Ln"
+
 [[family.method]]
 name = "measurement"
 kind = "query"
diff --git a/crates/ocs_doc_api/src/backend.rs b/crates/ocs_doc_api/src/backend.rs
index 3bed14d8e..0e004d6e3 100644
--- a/crates/ocs_doc_api/src/backend.rs
+++ b/crates/ocs_doc_api/src/backend.rs
@@ -78,6 +78,9 @@ pub trait DocApiBackend {
     /// Add a `TABLE` (rows × columns grid); returns the fresh `ObjectId`.
     fn add_table(&mut self, spec: &crate::ops::TableSpec) -> ApiResult<ObjectId>;
 
+    /// Add a 2-line angular `DIMENSION`; returns the fresh `ObjectId`.
+    fn add_dimension_angular2ln(&mut self, spec: &crate::ops::DimensionAngularSpec) -> ApiResult<ObjectId>;
+
     /// A dimension's measured value (distance for linear/radius, degrees for angular).
     fn dimension_measurement(&self, id: ObjectId) -> ApiResult<f64>;
 
diff --git a/crates/ocs_doc_api/src/executor.rs b/crates/ocs_doc_api/src/executor.rs
index 735ed8bc3..e6c626e42 100644
--- a/crates/ocs_doc_api/src/executor.rs
+++ b/crates/ocs_doc_api/src/executor.rs
@@ -304,6 +304,12 @@ pub fn apply_op<B: DocApiBackend>(b: &mut B, op: Operation) -> ApiResult<Receipt
             b.finalize_op();
             OpOutcome::NewId(id)
         }
+        Operation::CreateDimensionAngular2Ln(spec) => {
+            b.push_undo(name);
+            let id = b.add_dimension_angular2ln(spec)?;
+            b.finalize_op();
+            OpOutcome::NewId(id)
+        }
     };
     Ok(Receipt {
         outcome: Some(outcome),
diff --git a/crates/ocs_doc_api/src/facade.rs b/crates/ocs_doc_api/src/facade.rs
index d7ce04372..dabc2d8be 100644
--- a/crates/ocs_doc_api/src/facade.rs
+++ b/crates/ocs_doc_api/src/facade.rs
@@ -539,6 +539,14 @@ impl CurveCollection {
         Ok(Entity::new(self.session.clone(), id))
     }
 
+    /// A 2-line angular DIMENSION: angle between lines (vertex→first) and (vertex→second).
+    pub fn create_dimension_angular2ln(&self, vertex: [f64; 3], first_point: [f64; 3], second_point: [f64; 3], arc_location: [f64; 3]) -> ApiResult<Dimension> {
+        let receipt = self.session.apply_op(Operation::CreateDimensionAngular2Ln(crate::ops::DimensionAngularSpec {
+            vertex, first_point, second_point, arc_location,
+        }))?;
+        let id = receipt.outcome.and_then(|o| o.new_id()).ok_or_else(|| ApiError::Transport("create_dimension returned no id".into()))?;
+        Ok(Dimension::new(self.session.clone(), id))
+    }
     /// A radial DIMENSION for the circle centered at `center` through `point`.
     pub fn create_dimension_radius(&self, center: [f64; 3], point: [f64; 3]) -> ApiResult<Dimension> {
         self.create_dim_radial(Operation::CreateDimensionRadius, center, point)
diff --git a/crates/ocs_doc_api/src/gen/api_reference.md b/crates/ocs_doc_api/src/gen/api_reference.md
index ed7c2b9ac..1119bcf76 100644
--- a/crates/ocs_doc_api/src/gen/api_reference.md
+++ b/crates/ocs_doc_api/src/gen/api_reference.md
@@ -136,6 +136,7 @@ Linear dimension between two measured points. measurement() reads the distance;
 - **create_dimension_radius**(center: [f64; 3], point: [f64; 3]) -> `Dimension` — `CreateDimensionRadius`
 - **create_dimension_diameter**(center: [f64; 3], point: [f64; 3]) -> `Dimension` — `CreateDimensionDiameter`
 - **create_dimension_angular**(vertex: [f64; 3], first_point: [f64; 3], second_point: [f64; 3], arc_location: [f64; 3]) -> `Dimension` — `CreateDimensionAngular`
+- **create_dimension_angular2ln**(vertex: [f64; 3], first_point: [f64; 3], second_point: [f64; 3], arc_location: [f64; 3]) -> `Dimension` — `CreateDimensionAngular2Ln`
 
 ### Methods
 
diff --git a/crates/ocs_doc_api/src/gen/ops_gen.rs b/crates/ocs_doc_api/src/gen/ops_gen.rs
index c4c1f6266..be0246f20 100644
--- a/crates/ocs_doc_api/src/gen/ops_gen.rs
+++ b/crates/ocs_doc_api/src/gen/ops_gen.rs
@@ -56,4 +56,6 @@ pub enum Operation {
     CreateAttributeDefinition(AttributeDefinitionSpec),
     // tables
     CreateTable(TableSpec),
+    // dimension sub-types (2-line angular)
+    CreateDimensionAngular2Ln(DimensionAngularSpec),
 }
diff --git a/crates/ocs_doc_api/src/ops.rs b/crates/ocs_doc_api/src/ops.rs
index 32e02250c..f32284dce 100644
--- a/crates/ocs_doc_api/src/ops.rs
+++ b/crates/ocs_doc_api/src/ops.rs
@@ -233,6 +233,7 @@ impl crate::gen::Operation {
             CreateDimensionAngular(_) => "CreateDimensionAngular",
             CreateAttributeDefinition(_) => "CreateAttributeDefinition",
             CreateTable(_) => "CreateTable",
+            CreateDimensionAngular2Ln(_) => "CreateDimensionAngular2Ln",
         }
     }
 }
diff --git a/crates/ocs_doc_api/tests/mock_backend.rs b/crates/ocs_doc_api/tests/mock_backend.rs
index 2488f29df..82909cd86 100644
--- a/crates/ocs_doc_api/tests/mock_backend.rs
+++ b/crates/ocs_doc_api/tests/mock_backend.rs
@@ -146,6 +146,11 @@ impl DocApiBackend for MockBackend {
         }
         Ok(self.alloc("AttributeDefinition"))
     }
+    fn add_dimension_angular2ln(&mut self, _spec: &ocs_doc_api::ops::DimensionAngularSpec) -> ApiResult<ObjectId> {
+        let id = self.alloc("Dimension");
+        self.dimension_measurements.insert(id, 90.0); // mock: 90 degrees
+        Ok(id)
+    }
     fn add_table(&mut self, spec: &ocs_doc_api::ops::TableSpec) -> ApiResult<ObjectId> {
         let cols = spec.data.first().map(|r| r.len()).unwrap_or(0);
         if spec.data.is_empty() || cols == 0 || spec.data.iter().any(|r| r.len() != cols) {
diff --git a/crates/ocs_doc_api/tests/spec_wire_consistency.rs b/crates/ocs_doc_api/tests/spec_wire_consistency.rs
index c646aabbe..012137b27 100644
--- a/crates/ocs_doc_api/tests/spec_wire_consistency.rs
+++ b/crates/ocs_doc_api/tests/spec_wire_consistency.rs
@@ -71,6 +71,7 @@ fn operation_variants() -> Vec<String> {
             tag: String::new(), prompt: String::new(), default_value: String::new(), insertion_point: [0.0; 3], height: 0.0, rotation: 0.0,
         }),
         Operation::CreateTable(ocs_doc_api::ops::TableSpec { insertion_point: [0.0; 3], data: vec![] }),
+        Operation::CreateDimensionAngular2Ln(ocs_doc_api::ops::DimensionAngularSpec { vertex: [0.0; 3], first_point: [0.0; 3], second_point: [0.0; 3], arc_location: [0.0; 3] }),
     ];
     // Derive the variant names by serializing a probe of each and reading the
     // bincode variant index -> name map is not available; instead match by
@@ -165,6 +166,7 @@ const OPERATION_BASELINE: &[&str] = &[
     "CreateDimensionAngular",
     "CreateAttributeDefinition",
     "CreateTable",
+    "CreateDimensionAngular2Ln",
 ];
 
 /// Recorded baseline of the `Query` variant order.
diff --git a/src/app/doc_api.rs b/src/app/doc_api.rs
index 1a2bb9b21..1c3197257 100644
--- a/src/app/doc_api.rs
+++ b/src/app/doc_api.rs
@@ -306,6 +306,16 @@ impl DocApiBackend for HostSession<'_> {
         Ok(handle_to_obj(handle))
     }
 
+    fn add_dimension_angular2ln(&mut self, spec: &ocs_doc_api::ops::DimensionAngularSpec) -> ApiResult<ObjectId> {
+        use acadrust::entities::{Dimension, DimensionAngular2Ln};
+        use acadrust::types::Vector3;
+        let v3 = |p: [f64; 3]| Vector3::new(p[0], p[1], p[2]);
+        let mut dim = DimensionAngular2Ln::new(v3(spec.vertex), v3(spec.first_point), v3(spec.second_point));
+        dim.dimension_arc = v3(spec.arc_location);
+        let handle = self.scene_mut().add_entity(EntityType::Dimension(Dimension::Angular2Ln(dim)));
+        Ok(handle_to_obj(handle))
+    }
+
     fn add_table(&mut self, spec: &ocs_doc_api::ops::TableSpec) -> ApiResult<ObjectId> {
         use acadrust::entities::Table;
         use acadrust::types::Vector3;
@@ -1234,6 +1244,31 @@ mod tests {
         }
     }
 
+    // ── Phase 2c-iii: 2-line angular dimension ────────────────────────────────
+
+    #[test]
+    fn phase2ciii_dimension_angular2ln() {
+        let mut app = OpenCADStudio::new_for_test();
+        let mut host = HostSession::new(&mut app, 0);
+        // Angle between line (0,0,0)->(10,0,0) and (0,0,0)->(0,10,0) = 90 degrees.
+        let ang = new_id(&dispatch(&mut host, DocApiEnvelope::op(Operation::CreateDimensionAngular2Ln(
+            ocs_doc_api::ops::DimensionAngularSpec {
+                vertex: [0.0; 3], first_point: [10.0, 0.0, 0.0], second_point: [0.0, 10.0, 0.0], arc_location: [5.0, 5.0, 0.0],
+            }))).unwrap());
+        let receipt = dispatch(&mut host, DocApiEnvelope::queries(vec![
+            Query::GetDimensionMeasurement { id: ang },
+            Query::GetEntity { id: ang },
+        ])).unwrap();
+        match &receipt.query_results[0] {
+            QueryResult::DimensionMeasurement(v) => assert!((*v - 90.0).abs() < 0.1, "angle {v}"),
+            other => panic!("expected measurement, got {other:?}"),
+        }
+        match &receipt.query_results[1] {
+            QueryResult::Entity(e) => assert_eq!(e.kind, "Dimension"),
+            other => panic!("expected entity, got {other:?}"),
+        }
+    }
+
     // ── Phase 5 remaining: typed raster image create ─────────────────────────
 
     #[test]