MAGNETOTRANSPORT IN A PSEUDOMORPHIC GAAS/GA0.8IN0.2AS/GA0.75AL0.25AS HETEROSTRUCTURE WITH A SI DELTA-DOPING LAYER gan Vanderburgt, M, Karavolas, V, Peeters, F, Singleton, J, Nicholas, R, Herlach, F, Harris, J, Vanhove, M, Borghs, G