YES

3 decompositions
 #1 -----------
   1: F(x1,x2) -> c(A())

 #2 -----------
   2: G(x1) -> x1

 #3 -----------
   3: h(x1) -> c(x1)

@Jouannaud and Kirchner's criterion
--- R
   1: F(x1,x2) -> c(A())

--- S
   1: F(x1,x2) -> c(A())


@Jouannaud and Kirchner's criterion
--- R
   2: G(x1) -> x1

--- S
   2: G(x1) -> x1


@Jouannaud and Kirchner's criterion
--- R
   3: h(x1) -> c(x1)

--- S
   3: h(x1) -> c(x1)