 Solution

ID: past-exam-of-the-materials-science-course-of-the-university-of-cambridge/2017/paper-1/4/a/ii/solution

The basal close-packed planes of a hexagonal close-packed structure are ${0001}$ in four-index Miller-Bravais index, or

{001}

with three hexagonal indices. Their stacking is $A B A B \dots$ : alternate layers return above the same lateral positions.

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