Electronic and magnetic studies of {kappa}-(BEDT-TTF){sub 2}Hg(SCN){sub 2}Cl

DC resistivity and electron spin resonance (ESR) measurements have been performed on the two-dimensional organic conductor {kappa}-(BEDT-TTF){sub 2}Hg(SCN){sub 2}Cl. Due to electronic correlations, the compound undergoes a transition from a metallic to an insulating state at T{sub MI} = 34 K. The ESR parameters exhibit a drastic change below T{sub afm} = 27 K that evidences a magnetic phase transition. In this low-temperature state, we observe the characteristics of antiferromagnetic resonances in the angular dependence of the g-value.