The Ewald summation formula for a triply periodic, charge neutral
system has already been given in (2).
For a doubly periodic system, periodic in x and y, but not in z,
ϕ2P,R(x,ξ) has been defined in (5),
¯ϕ2P,F(x,ξ) in (22) and
¯ϕF,¯k=0(x,ξ) in (24…