To simplify Policy management, R80 organizes the policy into Policy Layers. A layer is a set of rules, or a Rule Base.
For example, when you upgrade to R80 from earlier versions:
* Gateways that have the Firewall and the Application Control Software Blades enabled will have their Access Control Policy split into two ordered layers: Network and Applications.
When the gateway matches a rule in a layer, it starts to evaluate the rules in the next layer.
* Gateways that have the IPS and Threat Emulation Software Blades enabled will have their Threat Prevention policies split into two parallel layers: IPS and Threat Prevention.
All layers are evaluated in parallel
Reference: https://sc1.checkpoint.com/documents/R80/CP_R80_SecMGMT/html_frameset.htm?
topic=documents/R80/CP_R80_SecMGMT/126197

Explanation
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Explanation/Reference:
Explanation:

Reference: http://dl3.checkpoint.com/paid/0c/0caa9c0daa67e0c1f2af3dd06790bc81/ CP_R77_Gaia_AdminGuide.pdf?HashKey=1479835768_76058f0fc4209e38bc801cd58a85d7c5&xtn=.pdf