Question about Periodic Boundary Condition Removing

Dear all,

In my MD system created by MS, it has periodic boundary condition in all of the three dimensions, I can remove the periodic boundary conditions in all of the three dimension by select Build丨Symmetry丨Nonperiodic Superstructure.

But I want to remove the periodic boundary condition in only one or two dimonsions, how should I do?

Thanks.

Best regards,

Yours

CHENG Xu