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We present a cluster covering scheme to construct the two-dimensionaloctagonal quasilattice. A quasi-unit cell is successfully found which is atwo-color cluster similar to the Gummelt's two-color decagon in five-foldquasilattice. The quasi-unit cells overlap each other following certaincovering rules and thus lead to a perfect octagonal quasilattice.

Quasi-unit cell description of two-dimensional octagonal quasilattice