  We present surface resistance measurements of the archetypical heavy-fermion
compound CeCu6 for frequencies between 3.7 and 18 GHz and temperatures from 1.2
to 6 K. The measurements were performed with superconducting stripline
resonators that allow simultaneous measurements at multiple frequencies. The
surface resistance of CeCu6 exhibits a pronounced decrease below 3 K, in
consistence with dc resistivity. The low-temperature frequency dependence of
the surface resistance follows a power law with exponent 2/3. While for
conventional metals this would be consistent with the anomalous skin effect, we
discuss the present situation of a heavy-fermion metal, where this frequency
dependence might instead stem from the influence of electronic correlations.
