cupressu macrocarpa air layer?

Hello, has anyone air layered a cupressus macrocarpa before? i just wanted to know if the thickness would be an issue, the branch i have my eye on is around 40mm thick, would a thinner branch be more successful in rooting?
thanks for any advice.

I haven't layered one of these but don't see why branch thickness should be an issue

Dave

well iv done the air layer so time will tell!!!
i gonna try an air layer on a boxwood in my garden to, again not sure if its to thick, and its old wood, i would like to do it on the main trunk which is about 100mm thick, iv looked on the internet but cant seem to find any info on thickness, its gonna be trial and error :S