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Hi,
I model a surface (not a bulk) and I want to optimize the lattice vectors in the xy plan, but keep the lattice vector in the z direction unchanged. Does anyone knows how to do it ?.
Additionally, I want to let the ions, to be optimized in the z direction.
Thanks

See the ISIF tag,

For ion relaxation, use selective dynamics in POSCAR:

x y z F F T

Cheers

I model a surface (not a bulk) and I want to optimize the lattice vectors in the xy plan, but keep the lattice vector in the z direction unchanged. Does anyone knows how to do it ? Additionally, I want to let the ions, to be optimized in the z direction.

I think the best way is to perform a series of calculations with different x and y lattice vectors. For each calculation, you can fully relax the atomic positions.