We have measured the angular distribution of electrons produced by microwave ionization of Na in a 9.4-GHz field. Microwave fields of up to 10.5 kV/cm with linear, circular, and elliptical polarizations were generated in a rotatable Fabry-P\'erot cavity. The electron angular distributions obtained are consistent with the predictions of a classical theory of above-threshold ionization in the low-frequency limit.
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Baruch et al. (1991) studied this question.