PROBABLE LESS THAN STANDARD SEPARATION BETWEEN GA-SMA AND ACR-WDB ON MISSED APCH.

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I WANTED TO EXPOSE THE STUDENT TO THE PROCS FOR TRANSITING A TCA; SO WE CALLED BAY APCH WHILE STILL N OF THE GOLDEN GATE AND RECEIVED THE REQUESTED CLRNC THROUGH THE TCA; WITH INSTRUCTIONS TO STAY W AND S OF THE BAYSHORE FREEWAY AT 3500'. I HANDLED ALL OF THE COMS WITH APCH MYSELF. WHEN WE WERE ABOUT 2 MI W OF SFO; I HEARD THE CTLR DESCRIBING AS TFC AN ACFT WHICH WAS OBVIOUSLY OURS (VFR SMA SEBND AT 3500'). I DIDN'T CATCH THE OTHER PLT'S RESPONSE. THE CTLR THEN IMMEDIATELY CALLED US AND DESCRIBED 'JET TFC CLBING BELOW YOU AT 11 O'CLOCK.' I REPLIED THAT WE WERE LOOKING. WE COULDN'T FIND THE TFC FOR SEVERAL SECS. THEN AS I LOOKED STRAIGHT AHEAD I SAW A WDB COME INTO VIEW OVER THE TOP OF MY COWLING; PERHAPS HALF A MILE AWAY AND CLBING DIRECTLY AT US. I TOOK EVASIVE ACTION. THE WDB DID NOT TAKE EVASIVE ACTION AND I DON'T KNOW WHETHER HE EVER SAW US. MY BEST GUESS IS THAT IF I HADN'T TURNED; THE WDB MIGHT HAVE PASSED 100-200' DIRECTLY BELOW US. IT WAS DEFINITELY A CONFLICT SITUATION. IF WE HAD BEEN TRIMMED IN A MORE NOSE HIGH ATTITUDE OR BEEN FLYING A PLANE WITH A MORE RESTR VIEW OVER THE COWLING; IT COULD HAVE BEEN SEVERAL ADDITIONAL SECONDS BEFORE WE WERE ABLE TO SEE THE TFC; PERHAPS TOO LATE TO MANEUVER. THE TFC WAS UNEXPECTED SINCE WE WERE LOOKING DIRECTLY FROM THE DEP END OF RWYS 28 WHICH WERE BEING USED FOR ARRS ONLY. I GATHERED FROM LATER RADIO CONVERSATIONS THAT THE AIRLINER HAD BEEN GIVEN A GO AROUND; WHICH IS WHY HE WAS HEADED IN OUR DIRECTION. IN THE CIRCUMSTANCE; I WOULD HAVE MUCH PREFERRED THAT THE CTLR GIVE US A VECTOR RATHER THAN A SIMPLE TFC CALL. IN THE END THERE WAS NO DAMAGE BEYOND A COUPLE OF STARTLED PLTS IN A LITTLE AIRPLANE. BUT; IT WAS AS CLOSE TO A SAN DIEGO LIKE INCIDENT AS I EVER HOPE TO COME.