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The superconducting state of a two-dimensional electron gas in the presence of a subgroup with a high density of states (DOS) is studied. It is shown that in this system a strong electron-phonon coupling arises; in addition, an important role is played by two-dimensional plasmons. The theory is applied to a description of the properties of the recently discovered class of materials with high T₂. Their low dimensionality and the presence of groups with high DOS makes these materials unique.
Vladimir Z. Kresin (Mon,) studied this question.