  We investigate the influence of intense, elliptically polarized driving
fields on high-order harmonic spectra from aligned diatomic molecules. We
derive a generalized two-center interference condition for elliptically
polarized fields, which accounts for s-p mixing and the orbital symmetry,
within the strong-field and the single-active electron approximation. We show
that the non-vanishing ellipticity introduces an effective dynamic shift in the
angle for which the two-center interference maxima and minima occur, with
regard to the existing condition for linearly polarized fields. This shift
depends on the ratio between the field-dressed momentum components of the
returning electron parallel and perpendicular to the major ellipticity axis
along each possible orbit. Because of this dependence, we find that there will
be a blurring in the two-center interference minima, and that increasing
ellipticity leads to splitting in such patterns. These features are
investigated in detail for H2 and Ar2.
