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Monte Carlo study of the prewetting supercritical phase

By means of Monte Carlo simulations, we investigate prewetting and its supercritical phase. First, we discuss the general properties of prewetting and obtain global phase diagrams. Secondly, we study the prewetting supercritical phase, in which density fluctuations in a film play an important role. We derive isotherms of two-dimensional compressibility from structure factors of the first adsorption layer, and find that the extension of the prewetting line is given by the location of the maxima of the isotherms. Our results complement recent mercury-on-sapphire experiments.