No, Duncan. It may have an inside, but there isn't an inner side in there.
If instead of sides we say faces, please show me where you believe the inner face is.
The 4th side of the Coin can never be seen, just like the inside of a Black Hole can never be seen.
Any outside surface of any solid object must have an inside contained within its mass.
This inside volume is a component of the outside surface just as the outside surface is an exterior component of the inside volume.
Repeat: One can't exist without the other.