[Pw_forum] constraint

[yuva rani]

Dear QE users,
 I am constructing a metal-organic interface.I built an layered
structure using matreial studio and the cartesian coordinates are
taken using chemcraft. Here I have to relax the stacked structure
using constraints. But I did not know much about the usage of
constraints. so please anyone help me with the input example involving
constraints.

Thanks in advance.