At very large tilt of the magnetic (B) field with respect to the plane of a
two-dimensional electron system the transport in the integer quantum Hall
regime at nu =4, 6, and 8 becomes strongly anisotropic when two electrical
subbands are occupied. At these filling factors the usual deep minima in th
e magnetoresistance occur for the current flowing perpendicular to the in-p
lane B field direction but develop into strong maxima for the current flowi
ng parallel to the in-plane B field. The origin of this anisotropy is unkno
wn but resembles the recently observed anisotropy at half-filled Landau lev
els.