General | Combat Stamina
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Greater Shield Focus (Combat) Source PRPG Core Rulebook pg. 125 You are skilled at deflecting blows with your shield. Prerequisites: Shield Focus, Shield Proficiency, base attack bonus +1, 8th-level fighter. Benefit: Increase the AC bonus granted by any shield you are using by 1. This bonus stacks with the bonus granted by Shield Focus. Combat Trick (from the Combat Stamina feat) Source Pathfinder Unchained pg. 121 When an attack is made against you while you are using a shield, you can spend up to 4 stamina points. For that attack, your shield bonus increases by an amount equal to the number of stamina points you spent. This increase does not stack with any gained from the Shield Focus combat trick.

Greater Shield Focus (Combat)

Source PRPG Core Rulebook pg. 125
You are skilled at deflecting blows with your shield.

Prerequisites: Shield Focus, Shield Proficiency, base attack bonus +1, 8th-level fighter.

Benefit: Increase the AC bonus granted by any shield you are using by 1. This bonus stacks with the bonus granted by Shield Focus.

Combat Trick (from the Combat Stamina feat)

Source Pathfinder Unchained pg. 121
When an attack is made against you while you are using a shield, you can spend up to 4 stamina points. For that attack, your shield bonus increases by an amount equal to the number of stamina points you spent. This increase does not stack with any gained from the Shield Focus combat trick.

Archives of Nethys

Greater Shield Focus (Combat)

Combat Trick (from the Combat Stamina feat)