Supplying Power to an Outbuilding - 4 Wire AWG 2 AL Type Use 2?
IF those wires are type USE, then your diagram is correct, no further conduit is required. Type USE is approved for direct burial as indicated.
On another note, a #2 USE wire is rated for 90 Amps in such an application.
You can use a 100 Amp panel in the garage, provided it is fed through a 90 Amp breaker at the source.
Life is uncertain -- eat dessert first!!
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