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3) On page 4 (3.1 Stability) and Table 1 the authors compare different configurations and note that the differences in energies are small. Although the relative value of the energies is small, there is still a difference of about 50meV between the various configurations, which is substantially higher than the thermal energy at room temperature. It is thus likely that the system will be found in the configuration with lowest energy at room temperature. The authors should discuss in a few sentences if there is an energy barrier between configurations and how large that barrier is.
  


Configuration        Ead(eV)
H(T1-T2)              -2.761
H(T1-T3)              -2.606
H(B1-B2)              -2.718
H(B1-B3)              -2.771
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