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Direct Monte Carlo sampling is employed to obtain estimates of excess surface free energies of three-dimensional XY models at criticality. Results for simple-cubic and body-centered-cubic lattices are consistent with universality of finite-size scaling amplitudes. The results are used to estimate the magnitude of the thinning effect, mediated by the incipient long-ranged correlations, on liquid-helium films at the \ensuremath{\lambda} point.

Critical surface free energies and universal finite-size scaling amplitudes of three-dimensionalXYmodels by direct Monte Carlo sampling