The Mat02 credit can be achieved by using the 'LCA for BREEAM UK' tool
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​Select the Mat02 EPD classification on the 'Building materials' question form:
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Get your Mat02 output on the results page:
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Copy your results to the Mat01/Mat02 Results Submission Tool:
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Submit the Mat01/02 Results Submission Tool together with inputs for Mat01 credit and with additional required documentation.

For more information, BRE's tutorials can be found here.