input.ini

   1 ; input file for the cluster expansion of lateral interaction of CO molecules adsorbed
   2 ; at bridge sites
   3 ;
   4 [cell_definition]
   5 ; first: definition of the unit cell in terms of multipliers of x,y of square c(2x2) unit cells
   6 unit_cell_x = 1
   7 unit_cell_y = 1
   8 ;
   9 ; now defining the CO adsorbate positions, for each adsorbed CO an own section
  10 [CO_1]
  11 x = 0.25
  12 y = 0.25