This paper contains the following concepts: definitions about polaron, concepts of
polarons, large polaron, small polaron, and development of quantum theory for electron
self-action potential in a system consisting of three contact different semi-c
onductor thin
layers, finding polaron potential energy, and studying the case in which an electron is
located inside the thin layer or on its surface. Studying the effect of dielectric anisotropy of
layers on electron-(hole) potential energy in the above mentioned thin layers.
