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A displacive, 2 nd order structural phase transition at T s =395 K from space group I4 2 m below T s to I 4/m c m above T s has been discovered in the two-dimensional spin dimer compound SrCu 2 (BO 3 ) 2 . The temperature evolution of the structure in both phases has been studied by Xray diffraction and Raman scattering, supplemented by differential scanning calorimetry and SQUID magnetometry. The implications of this transition and of the observed phonon anomalies in Raman scattering for spin-phonon and interlayer coupling in this quantum spin system will be discussed.

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