Abstract. In this work we report on spectrophotometric studies for two-layer granular films of Al-In alloys. The films are prepared using thermal precipitation in vacuum on roughened NaCl substrates heated to 300°C, with subsequent deposition of additional layer of a NaCl-substrate material. As a result, the two-layer granular films of the alloys are immured in the substrate material. The films reveal two bands of plasma optical absorption, low-and high-frequency ones. The results obtained are interpreted using a modified Hampe-Shklyarevsky theory.