MULTIPLE SCATTERING OF LIGHT BY A LAYER OF
              DISCRETE RANDOM MEDIUM. BACKSCATTERING

                         V.P.Tishkovets

       Astronomical observatory of Kharkov National University
            Sumskaya St.,35, Kharkov, 61022, Ukraine
               E-mail: tishkovets@astron.kharkov.ua


                             Abstract

The problem of multiple scattering of light by a layer of discrete
random medium is  considered. The medium is supposed to be rarefied
with scatterers randomly positioned in the layer. Backscattering of
light incident normally to the plane of the layer is considered.
The scattering matrix is presented as a sum of three matrices one
of them corresponding to incoherent scattering of light and difference
of the other two matrices describing coherent scattering. Equations
for calculation of these matrices are given.