Abstract
The effective medium theory of the long wavelength surface electromagnetic excitations of a multi-layered medium is employed to describe the surface plasmon-polaritons of a semi-infinite array of strictly two-dimensional charge sheets. A virtual p-polarised surface plasmon polariton is predicted and its associated attenuated total reflection (ATR) reflectivity calculated for typical parameters. The existence criteria for this surface polariton are less restrictive than for the Giuliani and Quinn surface mode. A radiative Brewster mode is also found and this mode may be observed via oblique incidence reflectivity.