Bidirectional Reflectance Distribution Function B.R.D.F cos θ and Total Integrated Scattering T.I.S
In FILMSCATTER software we use a theoretical framework to calculate the quantities B.R.D.F cos θ and the T.I.S. This is a first-order vector perturbation theory for a multilayer stack with inhomogeneities in the volume of the layers.I highly advise you to consult the references below for the validity of these models before you use the software.
The Bidirectional Reflectance Distribution Function cos θ is calculated versus the scattering angle.
The Total Integrated Scattering is calculated versus the wavelength.
The Power Spectral Density.