The coverage for this structure is θ = 1/2  ( θ = 0.5)

Rationale

In this instance , if we let the rectangular substrate unit cell be of unit area then the (2x1) cell of the adsorbate has an area of 2 units and contains one adsorbate atom : hence

Coverage = ( 1 / 2 ) x 1 = 0.50

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