  Model macroion solutions next to a charged wall show interface \textit{true
overcharging}, charge reversal and inversion, and layering. Macroion layering
is present, even if the wall or the macroparticle are \textit{uncharged} or if
the wall and macroions are like-charged. An effective long-range attractive
force between the adsorbed macroions is implied. The results are obtained
through an integral equation theory and a new extended Poisson-Boltzmann
theory, and are in accordance with experiments on confined macroions and
polymer layering.
