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A general formalism of the angular distribution of emitted electrons in the bound muon decay is made in terms of the multipole series of the relativistic electron wave functions. The effect of the finite size nucleus to wave functions is properly taken into account for the bound muon and emitted electron. In order to show the importance of this effect, energy spectra and asymmetry coefficients are given numerically in the cases of 16O, 40Ca, 90Zr and 208Pb.
Watanabe et al. (Wed,) studied this question.