CAPT OF A WDB ACR ACFT FAILED TO GET LNDG CLRNC DUE TO THE TWR DISCUSSION WITH THE PRECEDING LNDG ACFT'S LOCATION AFTER LNDG.

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THIS CAPT IS NOT ABSOLUTELY SURE WE RECEIVED A LNDG CLRNC. UPON POLLING THE OTHER CREW MEMBERS; THEY BELIEVE WE DID RECEIVE A LNDG CLRNC. THERE WERE SO MANY DISTRS; COUPLED WITH EXTREME FATIGUE; THAT I CANNOT BE SURE. I HAVE APCHED MY COMPANY TO REQUEST THAT THEY INCLUDE A CHALLENGE/RESPONSE OF 'LNDG CLRNC' IN THE BEFORE LNDG CHKLIST. AFTER REACHING THE HOTEL; I CALLED THE TWR AND SPOKE TO A SUPVR THAT WAS NOT ON DUTY AT THE TIME OF MY ARR AND WAS UNAWARE OF WHAT HAD HAPPENED. FROM THIS CONVERSATION I DISCOVERED THAT THE RWY 9R CTLR POS IN THE TWR IS ALSO RESPONSIBLE FOR ALL TXWY MOVEMENTS S OF RWY 9L. I ALSO DISCOVERED THAT THE PHL GND RADAR WAS RENDERED INOP ABOUT 6 MONTHS AGO AND IS NOT EXPECTED TO BE OPERATIONAL FOR ANOTHER 2 YRS. THIS EXPLAINS WHY THE TWR WAS SO INVOLVED WITH DETERMINING THE POS OF THE 2 ARRIVING FLTS AHEAD OF ME. HE WAS RESPONSIBLE FOR THEIR SEPARATION AND YET HE HAD TO DEPEND ON THEIR ACCURATE ASSESSMENT OF THEIR POS IN THAT HE HAD NO GND RADAR. WHEN THE HVT STATED THAT HE WAS UNSURE OF HIS POS AND SPOKE IN A HVY FOREIGN ACCENT; IT ONLY COMPLICATED THE MATTER.