All these points form another layer, or section of
the reciprocal lattice as shown in Fig. 6.5(b). Obviously we can build up as many
sections of the reciprocal lattice, representing as many planes in the crystal, as we
please; the ‘ground floor’ layer containing the h0l reciprocal lattice points, the section
one step along the b axis (the ‘first floor’layer) containing the h1l reciprocal lattice points
and so on.