  A new detector concept (R2D) is needed to harvest the unique physics
opportunities at RHIC-II during the LHC era. This concept is based on a high
granularity hermetic array of detectors featuring high momentum particle
identification and superior resolution for photon and onium measurements. Most
components of R2D can also be applied to future electron-ion interactions.
Thus, R2D allows us to perform precision QCD-type measurements at RHIC-II and
eRHIC.
