arriving Beijing on United from SFO, then to HKG on Air China, what terminals , how to transfer

You will land and depart from the same terminal - T3. Here is the transfer procedure from international to international:
STEP1: Flight Arrival
STEP2: Transfer Procedures
STEP3: Border Inspection (International Transfer passengers must go through immigration transfer desk.)
STEP4: Security Check
STEP5: Custom Inspection
STEP6: Waiting & Boarding

Thank you very much. Can youtell me the locations of the immigration transfer desk, the security check, and the custom inspection ? Are they all in T3 ? Is 2 hrs enough for all these ?
Thank you again.
An

The immigration transfer desk is at T3 for sure, but it is hard to tell the location. Just follow the clear signages to find that. And two hours will be enough for the transfer. Take it easy!