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Caption : band structures and total density of states for (a) rb2alinbr6 and (b) rb2alincl6 using soc

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Caption : fig. s2 elastic constants of rb2alinx6 (x = cl, br)

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Caption : fig. s3 2d and 3d diagram of (a) g (b) e (c) linear compressibility and (d) v of rb2alincl6 in different planes

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Caption : fig. s4 2d and 3d diagram of (a) g (b) e (c) linear compressibility and (d) v of rb2alinbr6 in different planes