Comment on Synthesis of rhenium nitride crystal with MoS2 structure

Kawamura et. al. recently published an article about the synthesis of rhenium nitride with MoS2-type structure [APL 100, 251910(2012)]. We disagree with the composition proposed by Kawamura. The compound synthesized by Kawamura is ReN3, or a compound of similar composition. What Kawamura did is to find the Re atomic positions of a compound where the nitrogen concentration remains unknown. This paper was rejected form APL. The reviewer comments (and our reply) are included here.