  We study area preserving Anosov maps on the two-dimensional torus within a
fixed homotopy class. We show that the set of pressure functions for Anosov
diffeomorphisms with respect to the geometric potential is equal to the set of
pressure functions for the linear Anosov automorphism with respect to
H\"{o}lder potentials. We use this result to provide a negative answer to the
$C^{1+\alpha}$ version of the question posed by Rodriguez Hertz on whether two
homotopic area preserving $C^\infty$ Anosov difeomorphisms whose geometric
potentials have identical pressure functions must be $C^\infty$ conjugate.
