Abstract
Shubnikov - de Haas oscillations corresponding to the spin-resolved Landau levels of the two-dimensional electron gas at an heterointerface were studied in wide ranges of magnetic fields (up to 22 T) and tilt angles. Dependences of the spin splitting on the parallel component of magnetic field were investigated for half-filled Landau levels , , , and . The exchange interaction was shown to be strongly dependent on the broadening and overlapping of adjacent Landau levels. On the basis of this model, the experimental magnetic field dependences of were described. As a result, the absolute value of bare g-factor , exchange energy and Landau level broadening were obtained.
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