The [2][2] element of the matrix used to rotate the subset of the Cartesian coordinates in the ATOM_SITE category identified in the STRUCT_SITE_GEN category to a view useful for describing the structural site. The conventions used in the rotation are described in _struct_site_view.details. |x'| |11 12 13| |x| |y'|~reoriented Cartesian~ = |21 22 23| |y|~Cartesian~ |z'| |31 32 33| |z|