  The coherent Bragg scattering of photons converted from solar axions inside
crystals would boost the signal for axion-photon coupling enhancing
experimental sensitivity for these hypothetical particles. Knowledge of the
scattering angle of solar axions with respect to the crystal lattice is
required to make theoretical predications of signal strength. Hence, both the
lattice axis angle within a crystal and the absolute angle between the crystal
and the Sun must be known. In this paper, we examine how the experimental
sensitivity changes with respect to various experimental parameters. We also
demonstrate that, in a multiple-crystal setup, knowledge of the relative axis
orientation between multiple crystals can improve the experimental sensitivity,
or equivalently, relax the precision on the absolute solar angle measurement.
However, if absolute angles of all crystal axes are measured, we find that a
precision of 2-4 degrees will suffice for an energy resolution of
$\sigma_E=0.04{\rm E}$ and a flat background. Finally, we also show that, given
a minimum number of detectors, a signal model averaged over angles can
substitute for precise crystal angular measurements, with some loss of
sensitivity.
