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Why do you think that VMC does not exist above cloud? Are you confusing the exemption which allows a/c at less than 3000 feet and less than 140 knots to be considered to be in VMC even if the (normally) required spacing from cloud cannot be maintained providing they are CLEAR of cloud AND in sight of the surface.
Once you are above 3000 feet, being in sight of the surface is not a requirement for VMC. The required spacing from cloud and in-flight visibility however are requirements for VFR flight above 3000ft.
I believe it is a licence requirement for basic PPL holders that they remain in sight of the surface at all times. However, this is a licence rule not a meteorological specification.