The energy spectrum of two-dimensional (2D) holes in a perpendicular m
agnetic field is investigated in p-type GaAs/AlGaAs single heterojunct
ions using a magneto-optical method based on the study of radiative re
combination of 2D holes with photoexcited electrons bound to donors. A
complex structure of both heavy- and light-hole energy levels is dire
ctly observed in luminescence spectrum, and the magnetic-field depende
ncies of the energy splittings between different quantum states of the
2D holes is studied using an analysis of circular polarization of the
magnetoluminescence. The experimental results are compared with the e
nergy spectrum of 2D holes calculated with the use of the 4x4 Luttinge
r k.p Hamiltonian and a reasonable agreement is established.