  We investigate the effects of multiple anisotropic light scattering by
interstellar dust particles on photometric profiles of disk galaxy models
computed using an iterative ray-tracing radiative transfer modeling code. It is
shown that anisotropic scattering must be fully accounted for in at least the
first scattering event for all considered cases. At the same time scattering
terms of the order higher than 5th can be safely approximated using the
isotropic phase function. The effects of isotropic approximation are most
significant in the galaxy models seen face-on with dust population extending
beyond the stellar disk, therefore the applicability of isotropic approximation
to a higher-order (2 to 5) scattering terms depends on the assumed galaxy model
parameters, namely, the optical depth, scattering albedo and the distribution
of interstellar dust with respect to stars.
