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We used single crystals of [A + (C 6 H 5 ) 4 ] 2 C 60-. B - as an ideal model system to determine accurately principal values and principal axes of the g-tensor of the C 60 mono radical anion embeded in a crystal field. The experimentally observed non axial g-tensor which corresponds to the molecular Jahn-Teller distortion of C 60- shows that the crystal field has stabilized the Jahn-Teller distortion of D 2h symmetry along a specific molecular C 2 axis. These stabilization occurs below a characteristic temperature T s for two C 60-. orientations (merohedral disorder) and depends on the cations as we could show by the substitution of P + for As + .