4
Put a small dab of lemon mix on plate to hold in place.Put 1 layer,cut side down on plate.Frost top with lemon mix.Add 2nd layer,cut side down.Add lemon mix.Repeat all 4 the same way.Any extra lemon can be put on sides to fill in gaps.Use remaining cool whip to frost top and sides of cake.Sprinkle with some decorative yellow sugar or a couple of lemon slices.Refrigerate until ready to serve.