Response to "Comment on Ferroelectrically induced weak ferromagnetism by   design," by R. de Sousa and J. E. Moore, arXiv:0806.2142
  A recent Comment [arXiv:0806.2142] has argued that "there is a simple duality between A-site and B-site" R3c ABO$_3$ materials and that our Letter [PRL 100, 167203 (2208)] "breaks this duality by ignoring a non-polar distortion that is directly measured in crystallography." Here we point out that this is not correct. The Comment contains three elementary crystallographic errors. In this response we address each error in some detail. 
Craig J. Fennie