The electronic dispersion of "Dirac" materials such as graphene and topological insulators is linear, resulting in a variety of peculiar electronic properties. In graphene and known topological insulators this linear dispersion is usually isotropic. Recently the materials SrMnBi2 and CaMnBi2 have been determined to host highly anisotropic 2D Dirac fermions in a square conducting layer of Bi. In addition, the structure contains a separate strongly correlated subsystem in MnBi layers, with bulk measurements showing evidence for 3D antiferromagnetism. Theoretical predictions suggest that coupling magnetism or superconductivity to anisotropic dirac fermions can produce a host of exciting new quantum phases including Majorana fermions. As the presence of magnetism is important to the transport properties, we propose to measure the magnetic structure in a 5g powder of both SrMnBi2 and CaMnBi2.