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. Consider a hexagonal lattice with basis vectors as shown in the figure below.
+ a +
If the lattice spacing is a =1, the reciprocal lattice vectors are
2π 2π
2π 2π
(a)
3
3 'V3
(b)
3 'V3,
(c) 0,
3
2л 2л
(d)
3'3
-27,

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