“…In this paper we present an investigation of the magnetic properties of the twodimensional analogue of CuPz(NO 3 ) 2 , namely copper pyrazine perchlorate (Cu(Pz) 2 (ClO 4 ) 2 ). This material has been the subject of several studies aimed at elucidating its properties 5,6,7,8,9,10 , although hitherto, no evidence of a magnetic transition has been found. We have carried out detailed specific heat and muon-spin relaxation measurements.…”