Diffusion theory for multilayered scattering media

We present an approximation to light propagation through skin using an improved multilayered diffusion equation. This equation allows for the influence of multiple layers on diffusely reflected light to be considered; which is accomplished by embedding imaginary point sources in the medium that correspond to each layer's transport mean free path. The new approximation is then compared to a previous two-layer solution by Farrell et al. to verify improvement as well as to results from Monte Carlo simulations to verify accuracy