relating to the growth of a thin crystal (= any solid consisting of atoms or molecules that are arranged in a regular structure) on top of another crystal, with both having a similar shape and structure

Any suitable material that allows epitaxial growth can be used as a substrate. 任何适合外延生长的材料都可用作基底。

The substrate includes an epitaxial layer where the memory cells of the computer are located.

The atomic structure of these crystals is epitaxial in many cases.