The full-potential linear muffin-tin orbital method is used to study t
he electronic structure of the solar energy material CuGaS2. From this
the optical reflectivity is calculated and compared with experiment,
both for the case when the polarization vector of the light, E is para
llel to the c-axis and when E is perpendicular to the c -axis. An enco
uraging agreement with experiment is obtained. (C) 1998 Elsevier Scien
ce B.V. All rights reserved.