Thick atomic layers of maximum density as bulk terminations of   quasicrystals
  The clean surfaces of quasicrystals, orthogonal to the directions of the main symmetry axes, have a terrace-like appearance. We extend the Bravais' rule for crystals to quasicrystals, allowing that instead of a single atomic plane a layer of atomic planes may form a bulk termination. 
Zorka Papadopolos and Gerald Kasner