Hello everyone..Can anybody please share me a link of a good quality posterboard which I can use to build my planes....
Or if anybody can suggest me a name..!!

https://www.vortex-rc.com/product-category/building-materials/depron-xps-foam/

Are these boards paper laminated....I mean a paper layer on its back

Are these boards paper laminated???

If it is it will be written on the product description. Or you can call them directly.

Greetings, Rivu.
Here you go : https://www.vortex-rc.com/product/fliteboard-30x20-5-sheet-pack/