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We demonstrate the existence of an interference contribution to the average magnetoconductance, G (B), of ballistic cavities and use it to test the semiclassical theory of quantum billiards. G (B) is qualitatively different for chaotic and regular cavities (saturation versus linear increase) which is explained semiclassically by the differing classical distribution of areas. The magnitude of G (B) is poorly explained by the semiclassical theory of coherent backscattering (elastic enhancement factor) ; interference between trajectories which are not exactly time reversed must be included.
Baranger et al. (Mon,) studied this question.
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