  We discuss a two-dimensional system under the perturbation of a Moire
potential, which takes the same geometry and lattice constant as the underlying
lattices but mismatches up to relative rotation. Such a self-dual model belongs
to the orthogonal class of a quasi-periodic system whose features have been
evasive in previous studies. We find that such systems enjoy the same scaling
exponent as the one-dimensional Aubry-Andre model $ \nu\approx 1 $, which
saturates the Harris bound $ \nu>2/d=1 $ in two-dimensions. Meanwhile, there
exist an infinite number of mobility edges different from the typical
one-dimensional situation where only a few or no mobility edges show up. An
experimental scheme based on optical lattices is discussed. It allows for using
lasers of arbitrary wavelengths and therefore is more applicable than the
one-dimensional situations requiring laser wavelengths close to certain
incommensurate ratios.
