Abstract
The AC magnetic susceptibility of the second-stage NiCl2-graphite intercalation compound along the easy plane has been measured in the presence of an external magnetic field parallel and perpendicular to the easy plane. The experimental result suggests that the intermediate 2D XY-like phase exists in the temperature range of Tc1<or=T<or=Tc2 (Tc1=17.30K and Tc2=19.40K) without an external magnetic field.