about cutoff in coul/cut

if i use coul/cut in a confine 2d system?is there any ways that widely be accept to set cutoff?
the confinement is a*a in 2D.
to set cutoff about 0.5a?

if i use coul/cut in a confine 2d system?

is there any ways that widely be accept to set cutoff?

what do you mean by this statement?

the confinement is a*a in 2D.
to set cutoff about 0.5a?

the way to figure out these things is to a) read the documentation
carefully and b) set up simple test systems where you compare the
result that LAMMPS computes with what you can compute manually.

axel.