Fig. 7
Thickness of quasi-liquid layers on ice surface measured by an ellipsometry. Solid and open squares indicate the results for {0001} and {1010} faces, respectively. In this figure, roughening temperatures expected from the observation of ice crystal shapes also are indicated[34]. That is, the roughening temperature for {1010} face was -2oC, but the roughening transition was not observed even at the melting point. It should be also noted that these experimental values were higher than the theoretical prospect to explain the habit change of snow crystal. This discrepancy is still in the challenge of research.

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