Millikelvin studies of in-plane magnetoconductance in short period Si/
Ge:Sb superlattices have been carried out in order to examine the effe
ct of anisotropy on quantum localization. The field-induced metal-to-i
nsulator transition has been observed, indicating the existence of ext
ended states. This suggests that despite anisotropy as large as D-para
llel to/D-perpendicular to approximate to 10(3) the system behaves as
3D in respect of localization by disorder.