You know with a little Nanolaminate Armor for R2, lasers would just split and reflect right off his dome piece. 

That COULD be an opportunity for a Pearlescent paint on R2, lol. If you so choose.

[MEDIA=youtube]F22Z6556rI8:1190[/MEDIA]

Fair warning this cartoon contains adult themes! This clip specifically has males without shirts and child soldiers in it (albeit piloting mechs)

But it also shows Nanolaminate Armor splitting a high-powered beam weapon! (lots of surrounding collateral damage from beams splitting too, again fair warning before viewing.)