Measurements of multilayer adsorption of solid ⁴He on graphite have been made for 0.965 K<~T<~1.24 K at intervals of {~} 15 mK using fourth sound in He II as a probe. The first observation of the increase of the two-dimensional critical temperature Tcj with increasing layer number j is reported. We extrapolate our values of Tcj for j→∞ and obtain the bulk-roughening transition temperature, confirming a prediction of current theories. The modeling of the acoustics including effects of the solid-liquid interface is also presented.
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Ramesh et al. (1984) studied this question.
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