We show that a two-dimensional spin system can occur for ``heavy,'' mJ=±{}3/2 holes resulting from a reduction to tetragonal symmetry produced by biaxial strain or confinement in a quantum well. Evidence is produced from magnetotransport measurements on strained Ga_1-x{In}ₓ$Sb/GaSb quantum wells, in which the spin splitting is determined only by the component of magnetic field in the growth direction, and from published work on unstrained GaAs/${Al}ₓGa_1-xAs heterojunctions. Complementary behavior is predicted for ``light'' holes.
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Martin et al. (1990) studied this question.