A plasma reactor includes a chamber body having an interior space that provides a plasma chamber, a gas distributor to deliver a processing gas to the plasma chamber, a workpiece support to hold a workpiece, an electrode assembly comprising a plurality of conductors spaced apart from and extending laterally across the workpiece support in a parallel coplanar array, a first RF power source to supply a first RF power to the electrode assembly, and a dielectric bottom plate between the electrode assembly and the workpiece support, the dielectric bottom plate providing an RF window between the electrode assembly and the plasma chamber.