We report measurements of a heat pulse diffusion in a glass substrate coated by 2.5 atomic layers of 4He. By comparison with data obtained on the bare glass substrate, we get values of the Kapitza resistance between the glass and the helium film. The value of the Kapitza resistance between a solid and a helium film has recently been the subject of a controversy. From our determinations, the values for thin films are comparable to that reported for bulk helium.
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