Crystal interface anisotropy
= Crystal interface anisotropy
{title2=$\gamma(\mathbf n),\quad M(\mathbf n)$}
A crystal's interfacial free energy and attachment kinetics depend on the interface normal $\mathbf n$. The orientation-dependent energy $\gamma$ and mobility $M$ select directions even when bulk diffusion is isotropic. This supplements the transport mechanism of <crystal dendrites>; isotropic transport alone does not specify the number of preferred arms.