The Combined Space Method for Composite Layers: by Reverse Scattering Perturbation
The purpose of the Reverse Scattering Perturbation (RSP) method  is to replace the inversion of a large matrix in (48) by a perturbation expansion over orders of scattering. In our version of RSP  we take into account that forward scatterings may not be treated as weak events, but must always be included exactly: only back-scatterings are assumed to be weak. This feature requires a logical ordering of the subplanes in terms of increasing distance from the surface.
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