&control
  prefix      = 'Si',
  calculation = 'scf',
  pseudo_dir  = './pseudo/',
  outdir      = './tmp/',
/
&system
  ibrav = 2, celldm(1) = 10.26, nat = 2, ntyp = 1,
  ecutwfc = 12.0,
/
&electrons
  conv_thr = 1.0d-8
/
ATOMIC_SPECIES
 Si 28.086 Si.pz-vbc.UPF
ATOMIC_POSITIONS
 Si 0.00 0.00 0.00
 Si 0.25 0.25 0.25
K_POINTS automatic
 6 6 6 1 1 1