Cut the cake into equal pieces and set aside.
Place one sheet cake onto your work surface or cake plate and moisten with the coffee syrup.
Spread 1/2 of the buttercream over the cake, making sure to keep it an even layer (maybe not so even).
Place another cake on top of the buttercream and moisten with more syrup.
Spread the ganache over the cake.
Place a third cake on top and again moisten with syrup.
Spread remaining buttercream over the top of this cake.
Place the final layer of cake on top, and pour the glaze over the top of the cake.
Refrigerate for one hour before trimming the sides to get a smooth finish.