sources.emission_matrix

Returns the emission matrix for a source between two layers.

s_matrix_before_source: The scattering matrix for the layer substack before the source, having no overlap with the after-source substack. Scattering matrix pairs returned by scattering.stack_s_matrices_interior may not be directly used.
s_matrix_after_source: The scattering matrix for the layer substack after the source.