The basal close-packed planes of a <hexagonal close-packed structure> are \b[$\{0001\}$] in four-index <Miller-Bravais index>, or $\{001\}$ with three hexagonal indices. Their stacking is \b[$ABAB\ldots$]: alternate layers return above the same lateral positions.

Solution

Past exam of the materials science course of the University of Cambridge / 2017 / Paper 1 / 4 / a / ii / Solution

 Solution (source code)