[Pw_forum] adding vacuum

[Jaret Qi]

Hello all,I am trying to minimize the interaction between my system and its periodic images. To do so, I introduced a layer of vacuum along the z-axis by increasing the lattice vector along the z-axis by 4A. At the same time, I fixed it by using this parameter: cell_dofree='2Dxy',But I have noticed atoms that are close to the vacuum move along the z-axis and vacuum is decreasing, is this wrong or I should use different cell_dofree?note:relaxation still ongoing, not relaxed yet.

JARET,ASU
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