I compute the Fabry-Perot plasmonic resonance eigenfrequencies for a system consisting of two noble metal parallel plates as function of the distance between the plates. Then, I show that the superradiance rate from an ensemble of two level-atoms placed between the two plates is enhanced when the atomic resonance frequency corresponds to one of the plasmonic resonance frequencies of the passive (cold) parallel-plates system of the same configuration. (c) 2012 Elsevier B.V. All rights reserved.