We report on magnetooptical studies of MBE-grown half-parabolic CdTe/C
dxMn1-xTe quantum well structures. The value of the valence band offse
t Q(v) = 0.4+/-0.05 was determined by comparing energies of optical tr
ansitions in the absence of a magnetic field with model calculations.
This value was verified by fitting the observed spin splitting of the
lowest heavy hole (hh) state. We discuss also the temperature dependen
ce of Q(v). PACS numbers: 78.66.Hf, 75.50.Pp.