Magnetic susceptibility, Cu NQR, and high-filed magnetization have been measured in polycrystalline SrCu 2 ͑BO 3 ͒ 2 having a two-dimensional (2D) orthogonal network of Cu dimers. This cuprate provides a new class of 2D spin-gap system ͑D 30 K͒ in which the ground state can be solved "exactly." Furthermore, in the magnetization, two plateaus corresponding to 1 4 and 1 8 of the full Cu moment were first observed for 2D quantum spin systems. [S0031-9007(99)08878-X]
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