Comment on ‘‘Anisotropy of the confined hole states in a (311)A AlAs/GaAs/AlAs quantum-well system: Evidence for a camel’s-back band structure’’

In a recent paper [Phys. Rev. B 46, 15 586 (1992)], Hayden et al. found a weak in-plane dispersion of the lowest valence subbands in (311)A quantum-well systems by magnetotunneling spectroscopy. There is only qualitative agreement between the experimental and calculated dispersions. We point out that this actually implies that the observed interface corrugations govern the unusual electronic properties of non-(100)-oriented heterostructures and hence have to be taken into account in the interpretation of the experimental data and especially in the calculations.