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Noncommercial-Share Alike 2.0 Licence UK: England & Wales

https://creativecommons.org/licenses/by-nc-sa/2.0/uk/

Consider a real unit cell with axes a and b separated by
the angle γ. The interplanar
spacing d_{100} is perpendicular to (100) planes and d_{010}
perpendicular to (010) planes.

In reciprocal space, the lattice vector a* is parallel
to d_{100},

b* to d_{010} and angle γ*
= 180 − γ

b* to d

The reciprocal lattice vectors, a* and b* have lengths
which are the reciprocals of the interplanar spacings.

Note: the real and reciprocal space lattices are not plotted on the same scale.

Note: the real and reciprocal space lattices are not plotted on the same scale.

The reciprocal unit cell can repeat just like a real unit
cell