Authentication against Google Apps domain

Hello, I'm looking for steps to configure a wireless network for WPA2-Enterprise encryption with 802.1X authentication against Google Apps domain. With this, your users should be able to use their Google Apps credentials to access secure wireless network. EAP-TTLS/PAP devices. Similar to what is detailed here ( https://wiki.freeradius.org/guide/Enterprise-WiFi), using configuration files for iOS devices and Mac OS computers. Thanks!