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We synthesized single crystals of the new hexagonal compoundsA$_2$Cu$_3$SnF$_{12}$ with A=Cs and Rb, and investigated their magneticproperties. These compounds are composed of Kagom\'{e} layers of corner-sharingCuF$_6$-octahedra. Cs$_2$Cu$_3$SnF$_{12}$ has the proper Kagom\'{e} layer atroom temperature, and undergoes structural phase transition at$T_\mathrm{t}\simeq 185$ K. The temperature dependence of the magneticsusceptibility in Cs$_2$Cu$_3$SnF$_{12}$ agrees well with the result of thenumerical calculation for $S=1/2$ two-dimensional Heisenberg Kagom\'{e}antiferromagnet down to $T_\mathrm{t}$ with the nearest exchange interaction$J/k_\mathrm{B}\simeq 240$ K. Although the magnetic susceptibility deviatesfrom the calculated result below $T<T_\mathrm{t}$, the rounded maxima wereobserved at approximately $T\simeq (1/6)J/k_\mathrm{B}$ as predicted by thetheory. Cs$_2$Cu$_3$SnF$_{12}$ undergoes three-dimensional magnetic ordering at$T_\mathrm{N} = 20$ K.

New S=1/2 Kagome Antiferromagnets A$_2$Cu$_3$SnF$_{12}$: A=Cs and Rb