[Tugindia] (no subject)

[renu at aero.iisc.ernet.in]

Dear Friends, 

I am not able to get double overbar for a character. 
Can some body help me to get the same.
 
I am getting a bar using:

 e.g. $\bar{x}$, I want a double bar on $x$. 

Thanks in advance. 

Renugopal