Originally Posted by
gadget
Your situation doesn't allow a companion (see link Guvner067 posted), judging by the same page (Lounges worldwide tab) it looks like you will be in the Royal Silk Lounge. I'd inquire with Thai Airways if you can buy access to this lounge for a companion. Keep in mind the complaints many people have of the TG lounges, and consider if lounge access is really worth it.
Or you both buy lounge access in Louis Tavern, I guess. But thats also a pretty sad lounge imho.
No buy-in option for the Thai lounges that I am aware of.
Agreed that the Louis Tavern lounges are pretty bleak. If the OP really wants to keep his travel party together (and depending on the length of the layover) the 2,000 baht would be better spend getting a nice meal in the terminal; especially since the companion is in Y.
SL