“…In (23) E ,~ depends on the lattice structure and on the parameter a,, which can be obtained from the boundary conditions ( A -2 cos a,) TI,, + T2,, = 0 , ( A -2 cos a,) q,, + q-l,r = 0 , where A is the surface parameter depending on the interaction constants and the coordination number in the surface layer [44,451 and describing the influence of the distribution of the electronic density near the surface on the electron eigenvalues for thin films. The parameters T,, are taken in the general form [45],…”