  Recent study of a high-mobility 2D hole gas in a strained Ge quantum well
revealed strong transport anisotropy in the quantum Hall regime when the
magnetic field was tilted away from the sample normal. In the present study we
demonstrate that the anisotropy persists to such high temperatures and filling
factors that quantum oscillations are no longer observed. This finding rules
out the formation of a stripe phase as a possible origin for the observed
anisotropy. However, we also show that the observed anisotropy is not
consistent with other known anisotropies, such as those arising from finite
thickness effects or surface roughness.
