surface diffusion
...that the surface diffusion of atoms on a material's surface is governed by Fick’s law?
...that the <b id="mwFKM"><a href="./Surface_diffusion" id="mwFKQ" rel="mw:WikiLink" title="Surface diffusion">surface diffusion</a></b> of <a href="./Adatom" id="mwFKU" rel="mw:WikiLink" title="Adatom">atoms on a material's surface</a> <i id="mwFKY">(pictured)</i> is governed by <a class="mw-redirect" href="./Fick's_law_of_diffusion" id="mwFKc" rel="mw:WikiLink" title="Fick's law of diffusion">Fick’s law</a>?