title: Comment on "Structures of GaN(0001)bf-(2x2), bf-(4x4), and bf-(5x5) surface reconstructions"
authors.affiliation: Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
authors.initials: V
authors.lastname: Ramachandran
authors.initials: CD
authors.lastname: Lee
authors.initials: RM
authors.lastname: Feenstra
authors.initials: AR
authors.lastname: Smith
authors.initials: DW
authors.lastname: Greve