The reactions e(+)e(-) --> e(+)e(-)e(+)e(-) and e(+)e(-) --> e(+)e(-)mu(+)mu(-), in a single tag configuration, are studied at LEP with the L3 detector. The data set corresponds to an integrated luminosity of 93.7 pb(-1) at root s = 91 GeV. Differential cross sections are measured for 1.4 GeV2 less than or equal to Q(2) less than or equal to 7.6 GeV2. The leptonic photon structure function F-2(gamma) and azimuthal correlations are measured for e(+)e(-) --> e(+)e(-)mu(+)mu(-). The related structure functions F-A(gamma) and F-B(gamma), which originate from interference terms of the scattering amplitudes, are determined for the first time. (C) 1998 Published by Elsevier Science B.V. All rights reserved.
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