Abstract
A brief review of the large variety of experimental investigations on the macroscopic properties of thin helium films is presented. It is shown that a phenomenological two-fluid model gives a satisfactory description of these properties, though at very small helium coverages a superfluid friction force must be introduced already at vanishingly small superfluid transport rates. The evidence that superfluidity in the very thin films is a manifestation of two-dimensional ordering is briefly discussed.
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