quantum-espresso/test-suite/pw_twochem/vc-relax_twochem.in

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&control
calculation = 'vc-relax'
tprnfor=.true.
tstress=.true.
twochem=.true.
/
&system
ibrav=2, celldm(1) =10.20,
nat=2, ntyp=1,
ecutwfc=12.0
nbnd=8
nbnd_cond=4
nelec_cond=0.1
occupations="smearing"
degauss_cond=0.01
degauss=0.01
smearing='gaussian'
/
&electrons
/
&ions
/
&cell
/
ATOMIC_SPECIES
Si 28.086 Si.pz-vbc.UPF
ATOMIC_POSITIONS {alat}
Si 0.00 0.00 0.00
Si 0.26 0.26 0.26
K_POINTS automatic
4 4 4 1 1 1