CF tops are a sandwich of CF/Spacer/CF in the case of a braceless flat top RainSong. A RainSong top has three different thicknesses (the no spacer sound hole edge and top edge are very thin, bulk of the top which has a spacer, and the thicker bridge plate). The Emeralds I owned had radiused tops and if there was a significant spacer, it was not obvious to me. The CAs I've owned also appeared to have little to no spacer in their not radiused flat braced tops. It is more complex than thickness.
The visible layer of CF in a RainSong has the standard series twill underneath it (spacer under that and the inside CF layers beneath the spacer). It is possible that the top layer is more about cosmetics.
You need to play them.
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