No idea but you will be out of luck with r*l*x... as far as I know they don't make watches in titanium.
There are fewer and fewer Men's reps in titanium, with the Breitling Avenger Seawolf, IWC GST Chrono and the PAM192 being phased out... leaving just the PAM036, PAM172, PAM176, PAM177 and the Breitling Chrono Avenger that I know of.
Good luck in your search, sorry I couldn't help you.