Photostimulated interaction in a sandwich-like thin film system based on PbI2 and Cu (photodoping effect) makes it possible to use the system as a recording medium. On the other hand, since the layer consisting of copper nanoparticles embedded into the PbI2 matrix is formed as a result of photodissolution of Cu film, this effect can be considered as an original way to produce nanocomposites. In this work, long-wave sensitivity of the PbI2-Cu2O-Cu system has been studied in conjunction with the structure of the PbI2 film. It has been established that, in the h < Eg (PbI2) spectral region the light absorption in PbI2 film and the metal film, the photodissolution rate is higher for the less compact (more porous) PbI2 films. [ABSTRACT FROM AUTHOR]