Abstract
Orientational order in weakly pinned Abrikosov flux lattices is studied, taking into account two heretofore neglected effects: dislocations and orientational couplings to the underlying lattice. Without orientational couplings, arbitrarily weak pinning destroys long-ranged orientational order for all spatial dimensions dfourfold symmetry, sixfold (hexatic) orientational order is described by a random-field Ising model, and so does not occur in d=2 (thin films) but does in d=3 (bulk).