Abstract
Measurements of the rf surface impedance of thin plates of cadmium as a function of magnetic field in low fields (0--- 100 G) indicate that two previously proposed mechanisms which cause a peak near zero field to be observed are operative in this case. The main intensity of the peak is caused by the length of specularly reflected skipping orbit trajectories matching the electron mean free path as proposed by Sibbald et al. Secondary structure on the high-field side of the peak is due to the electrons experiencing a critical scattering angle with the surface at which the surface scattering changes from specular to diffuse as proposed by Juras. Measurements of the frequency dependence of the field positions of the low-field structure and the radio-frequency size-effect linewidths support the existence of these two mechanisms being effective in this case.
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