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Energy differences [Eq.(1)] are important but they are not the relevant parameter when comparing the thermodynamic stability of different configurations. It is immediately clear that at least the chemical potentials for adatom will play an important role here (see e.g. Zhang and Northrup, Phys. Rev. Lett. 67, 2339); this should be discussed and clarified.
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The authors would like to thank the reviewers for insightful comments. As the reviewer point out (see Zhang and Northrup), chemical potential do play an important role in the thermodynamic stability of the native defects studies in semiconductor (GaAs). And the authors have add one sentence to discuss the importance of chemical potential in thermodynamic stability(cite that paper). However, the objective of this paper is to study the adsorption of ..., in which the chemical potential study for thermodynamic stability is not applicable and absorption energy study is sufficient.
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