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We have observed large increases in the transition temperature T₂ of thin, quenched composite films consisting of alternating layers of dissimilar metals. We estimate the regions of the film which experience the greatest increase to be within a few monolayers of the metal-vacuum or metal-metal surfaces. A possible explanation for the increased T₂'s is the shift in the electron-phonon coupling to larger values due to the lowering of the phonon frequencies.
Strongin et al. (Mon,) studied this question.
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