Comment on "Absence of anomalous Kapitza conductance on freshly cleaved surfaces"

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Abstract
The low heat-transfer coefficient between solids and liquid helium obtained from phonon reflection measurements, which was reported recently by Weber, Sandmann, Dietsche, and Kinder, are in good agreement with literature data obtained from traditional heat-transfer measurements on copper and silver. They also confirm the conclusion from those earlier studies that low values of the heat-transfer coefficients do not guarantee that acoustic mismatch has been obtained. A sensitive criterion to test the presence of additional mechanisms is the temperature dependence of the heat-transfer coefficient.