Why is a rough surface a good absorber and radiator of infrared?

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A rough surface is a good absorber and radiator of infrared due to its increased total surface area. This larger area allows for more interactions with incoming photons, leading to higher absorption rates. Additionally, photons reflect multiple times on a rough surface, increasing the likelihood of absorption. The complexity of the surface texture plays a significant role in these interactions. Overall, rough surfaces enhance both absorption and radiation of infrared energy.
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Why is a rough surface a good absorber and radiator of infrared?
 
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Because it's total "surface area" is increased.
But that's a simple answer which may not apply in all cases.
 
Because an incoming photon is reflected more times on a rough surface and so the chances of it being absorbed are higher.
 
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