Integrated authentication as a default in IE through group policy?

How do I set integrated authentication as a default in IE through group policy?

It?s easy to turn integrated authentication on through the Advanced Tab within Internet Options in Internet Explorer but I need to set this over and entire Organisational Unit in Active Directory.

I cant find any option for this in policy editor.

I?ve look through every option in the policy editor and searched the internet without any resolve.

Lots of useful information out there on group policy but no specific answer to my question.

Thanks

Martijn