Turning inner layers

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RₙX, where n is a subscript number and X is a digit, means:

perform X clockwise right turns on the n’th layer inward from the right face

Examples:

Code: R₀2 (equivalent to R2)
Cube (3x3): 
   005
   005
   005
111224333244
111224333244
111224333244
   550
   550
   550

Code: R₁2
Cube (3x3):
   050
   050
   050
111242333424
111242333424
111242333424
   505
   505
   505
Cube (4x4):
    0050
    0050
    0050
    0050
1111224233334244
1111224233334244
1111224233334244
1111224233334244
    5505
    5505
    5505
    5505

If n is larger than or equal to the size of the cube, it will act as a no-op. For example, R³2 on a 3x3x3 would be a no-op, but on a 4x4x4, it would turn the third face inward from the right face.

RⁿX, where n is a superscript number and X is a digit, means:

perform X clockwise turns on the m’th layer inward from the right face, where m is the value of memory location n.

So, if the notepad was 1, R⁶2 would turn the middle face on a 3x3x3 twice.

Combining superscripts and subscripts will result in undefined behavior. Each version of the interpreter handles sub/superscript integration differently. You should never combine subscripts and superscripts in the same command so the behavior will never be defined.

For a fun example of superscripts and double-struck integers, try running this code with any cube size (providing the single-integer cube size as input):

$
: (R⁶𝟞𝟞 *1-1/1)6
: (U⁶𝟞𝟞 *1-1/1)6
: (F⁶𝟞𝟞 *1-1/1)6

Try it online!