EN
Two-dimensional electron gas separated from Coulomb centers by a spacer is considered. Electrons are treated semi classically in limit of weak fluctuation and T = 0. Two screening models, Thomas-Fermi and RPA, are in dependently used. The second moment of the potential energy distribution is calculated analytically as a function of the spacer width. The qualitative arguments for the Gaussian character of the distribution are given and the density of states for such a distribution is calculated.