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The ATR IR spectra of solutions of atactic polystyrene in chloroform at the boundary with KRS 5 glass in the ranges 2800-3100 and 1550-1650 cm -1 are studied. It is shown that the parameters of orientation Σ and polarizability anisotropy of macromolecules estimated from the absorption and refractive indexes and the average complex polarizability of polystyrene boundary layers on KRS 5 vary in an extremum manner with the concentration of polystyrene in a solution. For dilute polystyrene solutions, a high degree of orientation of chains adsorbed on the glass surface is found. The inversion of the sign of polarizability anisot ropy and an increase in orientation parameter Σ of macromolecules in boundary layers on KRS 5 are associated with the compression and interpenetration of coils during the transition from semidilute to con centrated solutions of polystyrene.

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