It is shown that an asymmetric body-centered solid-on-solid model undergoes two roughening transitions, one of the Ising type (α=0) the other with α=-2. The model is further studied in the presence of screw dislocations and new evidence is provided for Kadanoff's conjecture that the Baxter line should appear in such a roughening model.
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H. J. F. Knops (1979) studied this question.
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