I've got it figured out.

Incase anyones interested here's how:

I followed the Maya help file on how to create a double sided shader

https://download.autodesk.com/global/...ber=d30e619807

Plugging in a black image file into the Condition Node COLOUR IF TRUE and a white image file into COLOUR IF FALSE.

Then connected the OUT COLOUR of the Condition Node to TRANSPARENCY instead of COLOUR.

Then I set the Reflectivity of the Phong to maximum.

Thats it!

Hope this is helpful to someone some day!