&control
calculation = 'scf'
tstress=.true.
/
&system
ibrav=2, celldm(1) =10.20,
nat=2, ntyp=1,
ecutwfc=12.0
&electrons
conv_thr=1.0e-8
ATOMIC_SPECIES
Si 28.086 Si.pz-vbc.UPF
ATOMIC_POSITIONS {alat}
Si 0.00 0.00 0.00
Si 0.25 0.25 0.25
K_POINTS {tpiba}
1
0.0 0.0 0.0 1.0