Since the RSU's vested while you were abroad, you will need to allocate your W2 between US and non-US sources since the W2 may report the full amount and not separate it into US-sourced income.
You will file a 1040 NR that is US-sourced income. For California, you would only report California-sourced income for the period of time you lived in California. In determining your allocation, you will use work days and not years or months. The formula in determining your US-sourced income is total number of of work days divided by the total work days in the vesting period.
Why is this important? When you file your California return, you will need to attach a statement showing the math on how you determined how many working days you worked while a California resident. California is strict about using working days and not months or years. It must be a precise calculation.
No, it isn't exempt. You are responsible for reporting your US income and California income when you were a resident of both jurisdictions.
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