LIGHT SCATTERING BY SMALL NON-SPHERICAL INHOMOGENEOUS (LAYERED) PARTICLES: THE APPLICABILITY OF APPROXIMATIONS V.G. Farafonov St.Petersburg University of Aerocosmic Instrumentation St.Petersburg, 190000 Russia M.S.Prokopjeva, V.B. Il'in Sobolev Astronomical Institute, St.Petersburg University St.Petersburg, 198504 St.Petersburg, Russia and Th.Henning Friedrich Schiller University, Jena, D-07745 Germany ABSTRACT The quasi-static approximation which is a generalization of the Rayleigh and Rayleigh-Gans approximations is considered for (layered) ellipsoids. The approximate expressions for cross-sections and elements of the amplitude matrix are given in the particle and laboratory coordinate systems. Calculations using the quasi-static and other approximations as well as exact methods were performed, and their results are briefly discussed.