What is the bond angle in the following molecular model of XeF2? 
Definitions:
Endothelium
A thin layer of cells lining the blood and lymphatic vessels, heart, and some other body cavities.
Tunica Intima
The innermost layer of a blood vessel, composed of endothelial cells, providing a smooth lining for blood flow.
Artery Wall
The layered structure of an artery, composed of an inner endothelium, a middle muscular layer, and an outer connective tissue.
Vasa Vasorum
Small vessels distributed to the outer and middle coats of larger blood vessels.
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