Added optika.materials.AbstractLayer.interface property. (#51)

optika/materials/_layers.py

@@ -52,6 +52,13 @@ def thickness(self) -> u.Quantity | na.AbstractScalar:
  def _thickness_plot(self) -> u.Quantity | na.AbstractScalar:
  """The thickness of the layer when plotted."""
 
+ @property
+ @abc.abstractmethod
+ def interface(self) -> None | optika.materials.profiles.AbstractInterfaceProfile:
+ """
+ The interface profile on the left side of this layer.
+ """
+
  @property
  @abc.abstractmethod
  def layer_sequence(self) -> LayerSequence:
@@ -161,11 +168,7 @@ class Layer(
 
  interface: None | optika.materials.profiles.AbstractInterfaceProfile = None
  """
- The interface profile for the right side of this layer.
-
- While it might be more natural to want to specify the interface profile for
- the left side of the layer, specifying the right side was chosen so that
- there would not be any coupling between subsequent layers.
+ The interface profile on the left side of this layer.
  """
 
  kwargs_plot: None | dict = None
@@ -415,6 +418,10 @@ def thickness(self) -> u.Quantity | na.AbstractScalar:
  def _thickness_plot(self) -> u.Quantity | na.AbstractScalar:
  return self.thickness
 
+ @property
+ def interface(self) -> None | optika.materials.profiles.AbstractInterfaceProfile:
+ return self.layers[0].interface
+
  def __getitem__(self, item: int | slice) -> LayerSequence:
  if isinstance(item, int):
  return self.layers[item]
@@ -542,6 +549,10 @@ def thickness(self) -> u.Quantity | na.AbstractScalar:
  def _thickness_plot(self) -> u.Quantity | na.AbstractScalar:
  return LayerSequence(self.layers).thickness
 
+ @property
+ def interface(self) -> None | optika.materials.profiles.AbstractInterfaceProfile:
+ return self.layers[0].interface
+
  @property
  def layer_sequence(self) -> LayerSequence:
  return LayerSequence(self.layers * self.num_periods)

optika/materials/_tests/test_layers.py

@@ -28,6 +28,16 @@ def test_thickness(
  result = a.thickness
  assert np.all(result >= 0 * u.nm)
 
+ def test_interface(
+ self,
+ a: optika.materials.AbstractLayer,
+ ):
+ result = a.interface
+ if result is not None:
+ assert isinstance(
+ result, optika.materials.profiles.AbstractInterfaceProfile
+ )
+
  def test_layer_sequence(
  self,
  a: optika.materials.AbstractLayer,