Electronic andmagneticstudiesof k-(BEDT-TTF)₂Hg(SCN)₂Cl

DC resistivity and electron spin resonance (ESR) measurements have been performed on the two-dimensionalorganicconductor k-(BEDT-TTF)₂Hg(SCN)₂Cl. Due to electronic correlations, the compound undergoes a transition from a metallic to an insulating state at T_MI= 34 K.The ESR parameters exhibit a drastic change below T_afm=27K that evidences a magnetic phase transition. Int his low-temperature state, we observe the characteristics of antiferromagnetic resonances in the angular dependence of the g-value.