CI-NEB results shown that migration barriers between adsorption structures on TMDs tend to be quite small across all three monolayers. In addition, many relaxations resulted in large migrations of Cu across the monolayer. This implies that motion of both single Cu atoms and Cu nanoclusters is likely to be dynamic at finite temperature. This dynamic and facile motion of metal atoms on WX 2 at finite temperature may significantly affect deposition and growth processes, and will be subject of further study.