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The local environment and oxidation state of Mn impurity in strontiumtitanate doped with 3% Mn were studied by X-ray absorption fine structurespectroscopy. The influence of the preparation conditions on the incorporationof the impurity into the $A$ and $B$ sites was studied. It was established thatMn ions substituting for Ti are in the Mn$^{4+}$ oxidation state and on-center.Mn ions substituting for Sr are in the Mn$^{2+}$ oxidation state, areoff-center and displaced from the lattice sites by $\sim$0.32 {\AA}. It wasdemonstrated that studies of the X-ray absorption near-edge structure can beused to determine the concentration ratio of Mn atoms located at the $A$ and$B$ sites.

Local environment and oxidation state of Mn impurity in SrTiO3 determined from XAFS data