ABSTRACT
Over the past 50 years there has been significant progress in the study and understanding of the bulk electronic properties of solids. With respect to the surface properties of solids such tendency started only recently. The absence of three-dimensional symmetry complicates any calculations, and the formulation and conduct of experiments with clean reproducible surfaces have been made possible only recently. The development of ultra-high vacuum technology led to the preparation of samples with single-crystal surfaces, close to ideal, and precision quantitative methods have been developed for the analysis of thin surface properties. At the same time, the contribution of theoretical physics to the development of the theory of the surface properties of solids, based on which their electronic properties should be calculated, is still insignificant.
