We present a detailed theoretical study of the in-plane dispersion of
the spin-orbit coupled valence band of GaAs-AlGaAs quantum wells grown
along the low-index directions (001), (011), (012), (111), (112) and
(113). We find that the confinement energies, warping, effective in-pl
ane masses and hole mixing strongly depend on the direction of confine
ment. Beside the numerical approach, we have developed a perturbative
scheme which is able to predict qualitative trends for confinement ene
rgies and in-plane effective masses.