A 2D Ni-Cr quasicrystal displaying a twelvefold symmetry consists of a dodecagonal quasiunit cell (QUC) which is an intergrowth of ${\mathrm{Zr}}_4$${\mathrm{Al}}_3$ and ${\mathrm{Cr}}_3$Si structures. If the QUC is represented by a geometric point, then this quasicrystal can be described by a quasilattice derived by a projection method.

• Received 18 March 1986

DOI:https://doi.org/10.1103/PhysRevLett.58.1020