&control
    calculation     = 'scf'
    prefix          = 'sic'
    restart_mode    = 'from_scratch'
    wf_collect      = .true.
    pseudo_dir      = './'
    outdir          = './'
    tprnfor         = .true.
    tstress         = .true.
 /
 &system
    ibrav           = 2
    celldm(1)       = 8.237
    nat             = 2
    ntyp            = 2
    ecutwfc         = 60
    occupations     = 'smearing'
    smearing        = 'mp'
    degauss         = 0.02
    nbnd            = 4
 /
 &electrons
    diagonalization = 'david'
    mixing_beta     = 0.7
    conv_thr        = 1.0d-10
 /
ATOMIC_SPECIES
  Si  28.0855     Si.pz-vbc.UPF
  C   12.01078    C.UPF
ATOMIC_POSITIONS alat
  Si  0.00  0.00  0.00
  C   0.25  0.25  0.25
K_POINTS automatic
6 6 6 0 0 0