For a pure single crystal in its melt the surface tension is given by the following expression:

_SL = _o + ₆ cos(6[])

where the angle refers to the crystallographic orientation. As the magnitude of ₆/_o increases from 0.0 to 0.1 what topological change (in the form of the crystal) occurs in the equilibrium shape? (Try plotting the reciprocal of versus polar angle to identify the condition at which you observe this topological change in equilibrium

shape.)